RE: what's the advantage?
Kick ass!! You got it to work. The clutch setup I always recommend is Mugen aluminum shoes and Mugen 1.0 springs. The brand of aluminum shoes doesn't really matter much (OFNA's worked just as well), but I have had better luck finding Mugen shoes cheap when I shop around. I have run composite shoes, and I find that they wear out much faster than my aluminum ones. Yet, I haven't really had to replace a clutch bell because of the shoes wearing it out. Only because the teeth wore down.